I'm certain David's told you his business troubles. it's no secret that he owes a lot of

问题补充：

Im certain Davids told you his business troubles. , its no secret that he owes a lot of money to the bank.

A. However

B. Anyway

C. Therefore

D. Though

答案：

A. However

(答案→)B. Anyway

C. Therefore

D. Though

解析：在语境中考查副词的用法。根据前面：I’m certain…看出为什么他那么肯定呢？是因为“无论如何他欠债都不是秘密了”。答案C把前因后果弄反了。